App: expose recompute controlling to Python

Add readable-writeable attribute "RecomputesFrozen" to DocumentObject.

src/App/DocumentPy.xml

@@ -205,6 +205,12 @@ Both parameters are optional.</UserDocu>
       </Documentation>
       <Parameter Name="Name" Type="String"/>
     </Attribute>
+    <Attribute Name="RecomputesFrozen">
+      <Documentation>
+        <UserDocu>Returns or sets if automatic recomputes for this document are disabled.</UserDocu>
+      </Documentation>
+      <Parameter Name="RecomputesFrozen" Type="Boolean"/>
+    </Attribute>
     <CustomAttributes />
   </PythonExport>
 </GenerateModel>

src/App/DocumentPyImp.cpp

@@ -573,6 +573,16 @@ Py::String DocumentPy::getName(void) const
     return Py::String(getDocumentPtr()->getName());
 }
 
+Py::Boolean DocumentPy::getRecomputesFrozen(void) const
+{
+    return Py::Boolean(getDocumentPtr()->testStatus(Document::Status::SkipRecompute));
+}
+
+void DocumentPy::setRecomputesFrozen(Py::Boolean arg)
+{
+    getDocumentPtr()->setStatus(Document::Status::SkipRecompute, arg.isTrue());
+}
+
 PyObject* DocumentPy::getTempFileName(PyObject *args)
 {
     PyObject *value;